title: [Pilot study on the correlation between high incidence of CD44+/CD24 -/low/ABCG2- cells and poor prognosis in breast cancer].
abstract: OBJECTIVE
  To explore whether the CD44+/CD24(-/low)/ABCG2(-) (ATP binding cassette superfamily G member 2) cells are associated with prognosis and clinical response in breast cancer patients.
  
  
  METHODS
  We investigated the paraffin-embedded tissues of 43 breast cancer patients with (23 cases) and without (20 cases) recurrences. Double-staining immunohistochemistry (IHC) was applied for the detection of CD44+/CD24(-/low) cells and single-staining IHC for ABCG2. Flow cytometry was used to analyze the CD45(-)/CD44+/CD24(-/low)/ABCG2(-) cells in 4 mL peripheral blood of patients with metastasis breast cancer and 11 healthy female volunteers as controls.
  
  
  RESULTS
  The positive rate of ABCG2 in recurrence-group was higher but with no difference compared with controls (78.3 % vs 60.0%, P = 0.32). Double-staining IHC revealed that the percentage of CD44(+)/CD24(-/low) cells was higher in recurrence-group than non-recurrence group(65.2% vs 35.0%, P = 0.048)and higher percentage of CD44+/CD24(-/low) cells was significant associated with poor overall survival(P = 0.031). Patients with higher percentage of CD44+/CD24(-/low) cells have shorter disease free survival (DFS), but have no statistical significance. Flow cytometry revealed that the CD45(-)/CD44+/CD24(- /low)/ABCG2(-) cells were higher in breast cancer patients than those of the volunteers (median 679/10(5) cells vs 12/10(5) cells). The cell number of this subset was affected by chemotherapy but was not statistically consistent with clinical response.
  
  
  CONCLUSIONS
  Our study suggests that CD44+/CD24(-/low) breast cancer stem cells in tumor tissue may be associated with poor prognosis. The incidence of CD44+/CD24(-/low)/ABCG2(-) cells in peripheral blood is more frequent in breast cancer patients but further investigation should be made to explore the relationship of this subset and disease prognosis.
authors.affiliation: Department of Medical Oncology, Beijing Cancer Hospital & Institute, Peking University School of Oncology, Beijing 100142, China.
authors.forename: Ji-fang
authors.initials: JF
authors.lastname: Gong
authors.forename: Yan-hua
authors.initials: YH
authors.lastname: Yuan
authors.forename: Guo-hong
authors.initials: GH
authors.lastname: Song
authors.forename: Jing
authors.initials: J
authors.lastname: Yu
authors.forename: Yan
authors.initials: Y
authors.lastname: Han
authors.forename: Jun
authors.initials: J
authors.lastname: Jia
authors.forename: Jun
authors.initials: J
authors.lastname: Ren
mesh_terms: D000070997:ATP Binding Cassette Transporter, Subfamily G, Member 2; D018528:ATP-Binding Cassette Transporters / Q000378:metabolism*; D000328:Adult; D001943:Breast Neoplasms / Q000378:metabolism* / Q000473:pathology; D051927:CD24 Antigen / Q000378:metabolism*; D005260:Female; D006801:Humans; D018960:Hyaluronan Receptors / Q000378:metabolism*; D008875:Middle Aged; D009363:Neoplasm Proteins / Q000378:metabolism*; D009364:Neoplasm Recurrence, Local / Q000378:metabolism; D014411:Neoplastic Stem Cells / Q000166:cytology*; D010865:Pilot Projects; D011379:Prognosis
chemical_list: C116614:ABCG2 protein, human; D000070997:ATP Binding Cassette Transporter, Subfamily G, Member 2; D018528:ATP-Binding Cassette Transporters; D051927:CD24 Antigen; D018960:Hyaluronan Receptors; D009363:Neoplasm Proteins